Open-hearth furnace.



L. L. KNOX 6; M. MURR Y.. OPEN HEAB'I'H runmon.

APPLICATION FILED .TAILQO, 190

Patented Oct. 26, 1909.

SHEET 1.

WITNESSES L. L. KNOX 6: M. MURRAY. OPEN HBABTB FURNACE.

AYPLIOATIO! nun an. so, was.

938,245. Patented Oct. 26, 1909.

WITQKSfiES INVENTORS Jfmm 11mm Q6 m r $23M,-

L. L. KNOX 6: M. MURRAY.

OPEN HEAETH FURNAGE.

APPLIUATION FILED JAN. 20, 1908.

Patented Oct. 26, 1909.

ESHBETB-SHEET 3.

WITN [55:5 WW

6 SHEETS-411E111. l.

L. L. KNOX dz M. MURRAY.

arm 11mm: ruamon. APPLIUATIOH FILED JAN. 20, 1908.

Patented Oct. 26, 1909.

L. L. KNOX & M. MURRAY.

OPEN HEARTH FURNACE.

APPLXGATION FILED JAH.20.190S

Patented Oct. 26, 1909.

5 SHEETS-SHEET 5 UNITED PATENT OFFICE.

LUTHER L. KNOX, OF BEN AVON, AND MONTGOMERY MURRAY, OF WILKINSBURG,PENNSYLVANIA, ASSIGNOBS T0 KEYSTONE FURNACE CONSTRUCTION COMPANY, OFPITTSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

OPEN-HEARTH FURNACE.

Specification of Letters Patent.

Patented Oct. 26, 1909.

Application filed January 20, 1908. Serial No. 411,586.

To all whom it "may concern:

Be it known that we, Lu'rnnn L. Knox, of Ben Avon, Allegheny county,Pennsylvania, and Mox'roonnnr M umAr, of Wilkinsburg, All gheny county,Pennsylvania, have invented a new and useful Open-Hearth Furnace, ofwhich the following is a full, clear, and exact description, referencebeing had to tlr accompanying drawin s, forming part of thisspecification, in whicl Figure l is a vertical section of one endportion of an open hearth furnace, showing one embodiment of ourinvention; Fig. 2 is an end view of the same; Fig. 3 is a view s milarto Fig. 1 showing the modification; Fig. 4 is an end view of the furnaceshown in Fig. 3; and Figs. 5, 6, 7, 8 and 9 are detail views showing theconstruction of different forms of water jackets or cooling frames whichmay be employed.

Our invention has relation to furnaces of the regenerative reversingtype, and is designed to provide means of improved character forprotecting the gas and air ports from the destructive action of the hotair and gases; and further to provide means whereby those parts of thefurnace which are more subject to destructive action are renderedreadily accessible for removal and re newal.

The precise nature of our invention will be best understood by referenceto the accompanying drawings, in which we have shown a number ofdifferent embodiments of our invention, and which will now be described,it being premised, however, that the invention is susceptible of variousother modifications by those skilled in the art withoutdeparting fromthe spirit and scope of the invention as defined in the appended claims.

Referring first to the form of our invention which is shown in Figs. 1and 2, the numeral 2 designates the frame of an open hearth furnace, 3the wall thereof, and 4 a portion of the hearth. 5 designates the gasport at one end of the furnace, (i the slag pit or pocket, and 7 the airports. one of which leads upwardly at each side of the gas port. The gasport leads upwardly into a box 8, having one or more twyer openings 9,two bciin shown. The box or chamber 8 is removal) v supported up n thetop of the walls of the line 5. and i \U.l(l((l with thereof by the wtgases.

wheels 10 mounted on studs 11 at its opposite ends, which wheels areadapted to travel on the tracks 12, the wheels 10 normally resting indepressions 13 in said tracks. At the joent between the box or chamber 8and the top of the flue 5 there is placed a water-cooled frame orcasting 14, which is supplied with water by a pipe 15 leading fromasupply pipe 16. A scaled joint at this point may effected by the use ofclay or other ct-mentitious material, with which the joint is luted. 17designate cooling boxes, which are inset into the walls of the box orchamher 8 for the purpose of prevcntin f or limit ing the cuttin r awayof the rickworl' T hesc boxes or lates are removably seated in theopenings in which they rest, and are supplied with water by thecirculating pipes 18.

The twyers 9 are extent ed from the box or chamber 8 to the furnace, andare each formed with a detachable end portion. These end portionsconsist of an outer water jacket 19 with a refractory inner lining 20.The water jackets 19 may consist of integral castings as shown in Fig. 8or they may be made up of separate castings as shown in Figs. 5 and 6.In the latter case, the top portion of the jacket constitutes onesection,

the bottom portion and separate section, and the side portions two othersections. The side sections may be conveniently secured to the top andbottom sections by means of the bolting flanges 22, and also by means ofthe securing rmgs or clamps 23, \Ylllt'll are seated in recesses 24formed in the castings and engaging over portions 25 of the castingswhich pro ect within said recesses (see lugs. (i and a is an integralcasting, and water isadmitted thereto from the supply pipe 16 by thebranch pipe 16*, and after circulating around the jacket passes out atthe outlet pipe 26, any suitable arrangement of baffles 27 beingprovided within the jacket to cause a complete circulation of the waterin contact with the entire wall surface thereof.

Where the jacket is made in separate sections, as shown in Figs. 5, 6and 7, the water preferably enters the bottom section by way 'of thepipe 28 at the u iper end of said se tion at or near its big test point,the water then dividing and a part passing by way ot the U-connection 28into one of the Him In the form shown in Fig. l the jacket 'lliisections and thence into the top section to the outlet 29, while theother part flows through the bottom section, and thence by theU-connection 30 into the other side section, and thence b theU-connection 31 into the top section. ach of the sections is rovidcdwith a suitable arran ement of afflin s 32 for causing a comp etecirculation of the water therein. By bringing the cold water into thelower section, at the highest point of the latter, we prevent theformation of steam pockets in said section, since an steam which formsin said section will wor its way upwardly in said section to the coldwater pipe. The battles 32 in the top may also be perforated to permit,escape of steam thercthrough, as shown at 32 in Figs. .5 and 6.

The air flues 7 at their up' r ends lead into a transversely arrange airbox or chamber 33, which is removabl mounted on the top of the fluewalls, an from which lead to the furnace a series of ports or twyers 34.These ports ortwyers are also each provided with a detachable endportion consisting of a water jacket 35 and an inner fractory lining 36,the construction of the removable end gaortions of the air ports ortwyers being 0 the same general character as the construction of theremovable end portions of the gas ports or twyers.

37 designates the water supply pipe for the water jackets 35, and 38 thewater outlet P T he removable end portions of the air and gas ports andtwyers may be conveniently secured to the main iortions of the twyerwalls by means of the bolting flanges 39.

It Wlll be observed that those portions of the gas and air ports whichare subjected to the greatest heat are entirely surrounded by a waterjacket which will greatly reduce the destructive action of the heat andhot gases. Furthermore, that when these end portions have become burnedout they can e readily detached and new ones put in 'place of them. Inthe case of the air orts or twyers this is effected by lifting o theentire box or chamber 33, thereby permitting access to the ends of thetwyers. In the case of the gas ports or twyers, to efiect the removalthe box or chamber 8 is moved back on the tracks 12 sufficiently towithdraw the t-w yers and permit access to them.

he provision of the cooling boxes 17 in the walls of the gas box orchamber 8 greatly reduces the destructive action thereon and extends thelife of the structure. Both the box 8 and box 33 can be readily removedand entirely replaced whenever necessary.

The construction shown in Figs. 3 and 4 is substantially the same asthat shown in Fig. 1, except that the air and gas ports are of somewhatdifferent form and arrangement, being intended for a furnace with oneand interior baffles 42.

gas and one air port, there being but a single gas twyer leading to thefurnace and a sinle air port or twyer. In this form also, in ion of thecooling boxes I? placed in the wall of the gas box 8, the front wall ofsaid box is protected by means of the cooling plate 40 having watercirculatin pipes 41 This p ate 40 is formed with inwardly projectingdowel extensions 43, having me ined faces forming dovetails betweenwhich the brickwork 44 is set, the s aces between said projectionsforming poc ets to hold and retain the brickwork. This constructionpermits the entire front walls of the box 8 to be removed and renewedwhen necessar In this form also the air box 33 instea of being supporteddirectl above the as box or. chamber in the form rst describe is setcloser to the furnace so that the gas box or chamber, as well as the airbox or chamber, can be readily lifted olf from its seat and removed.

It will be understood that each end of the furnace is provided with anarrangement of ports such as described, their arrangement at one endbeing a substantial. duplicate of that at the other end.

We do not wish to limit ourselves to the particular construction andarrangement of parts which we haveherein shown and described, as it willbe obvious that various changes may be made therein. Thus, the coolingjackets and plates'or boxes may be variously constructed and arranged,the battling and its water-circulating connections therefor may be ofany suitab e character, and other modifications may be made.

The advantages of our invention will be apparent to those skilled in theart, since by the construction and arrangement described not only areall parts of the gas and air ports which are subjected to the mostdestructive action suiliciently protected by the water jackets orplates, but such parts are so located and arranged that they can bereadily removed and renewed.

It will also be noted that the uptake fines for the gas and air haveseparate and independently constructed walls and that these up-takelines, together with the boxes which are removably supported at theupper ends of the same, and also the ports leadin therefrom into thefurnace, are surrounded by air so that they are air'cooled to a largeextent; The walls of these lip-takes are also constructed independentlyof the walls of the furnace.

While we have shown and described our invention in connection with anopen hearth furnace, it will be obvious that it is equally applicable.to other regenerative reversing furnaces.

We claim 1. A regenerative reversing furnace having gas and air up-takeflues, separate gas and air boxes removably supported upon the up erends of the respective 11p-ta|re lines.

and ports leading from said boxes tlirough the end \!ll of tile furnaceand nto the furnace: substantially as described.

2. ln :1 regenerative reversing lurnzu'e, :1

the furnace, said twyer having a removable \vateujacketcd end portionthe water jacket of which extends entirely around the port or twyer;substantially as described.

4. In a regenerative reversing furnace, an up-takc fine, a box orchamber removably supported at the upper end of the fine, and awater-cooled port or twyer leading from said box or chamber into thefurnace; substantially as described.

5. In a regenerative reversing furnace. a port. a box or chamberremovably supported at the )PQI end of the port. and twyer leading fromsaid box or chamber into the furnace, said twyer having a removablewater-jacketed end portion; substantially as described.

6. A regenerative reversing furnace having separate removable gas andairboxes, said boxes havin ports leading throu h the furnace well an? intothe furnace; su stantially as described. I

7. A regenerative reversingfurnace having separate removable gas and airboxes, said boxes havin ports or twyers leading to the furnace an saidorts or twyers hav in water-jacketed end portions; substantia lyasdescribedfl 8. A regenerative reversing furnace having removable gasand air boxes, said boxes having orts or twye'rs leading to the furnace,said orts or twyers having detachable wateracketed end portions;substantially as described.

9. In a regenerative reversing furnace, a gas port, a water-cooled frameor casting seated on the up or end of the walls of sai port, and a as oxor chamber removably seated on sand box or frame said gas box or chamberhaving a twyer leading therefrom through the end wall of the furnace andinto the furnacersubstantially as de-' scribed.

10. In a regenerative reversing furnace, an up-take assage, a boxremovably supported on t e upper end of said flue and aving awater-cooled tw er leading from the box through the furnace wall intothe furnace, the said box also having its outer all provided withwater-cooling means; -.ubstanliall v as described.

H. In :1 regenerative reversing furnace, :1 t1\' \'er having adetachable end portion consist lug ot'a water jacket formed of separablea hollow sections secured together and entirely surrounding the tivyeropening. and a refractory lining within said jacket; sub stantially asdescribed.

12. In a regenerative reversing furnace, a twver having a detachable endportion consisting of a water jacket composed of separate sectionsdetachably secured to each other. and an inner rcfractor lining,together with means for circuliiting water through said sections;substantially as described.

13. A regenerative reversim furnace. having a stationary furnace bod andhaving air and gas uptakes constructed with separate and independentwalls, and a separate airsurroundin port or twyer leading. from eachup-talre t rough the end wall of the furnace and into the furnace;substantially as described. 1

14. A regenerative reversing furnace, having an up-take passage, and aport or twyer leading from the uptake passage throu h the end wall ofthe furnace and into t c furnace, said port or twyer bein exposed to theatmosphere for a considerab e portion of its length for air-cooling, andalso provided with'water-cooling means; substantially as described.

15. A regenerative reversing furnace having gas and air lip-takes, andse )arately constructed and separately removab e ports connecting theup-takes with the furnace said ports leading through the furnace wallinto the furnace chamber; substantially as described.

16. A regenerative reversing furnace having gas and air lip-takes whosewalls are constructed separately of each other and also separately ofthe furnace walls, and separate gas and air boxes removably supported onthe up er end of the lip-takes and having orts or files leading into thefurnace chamer, said ports or flues having detachable water-cooledportions; substantially as de- 1 scribed.

17. A re cnerative reversing furnace havinggas and air up-take fines, atransversely extendin gas box supported on the upper I end of t e gasup-take flue, an air box removably sup orted on the upper end of the airu take ues, and ports or twyers leading rom said boxes tirou h the. endwall of the furnace and into the urnace chamber, said ports or twyersbeing removable with the boxes; substantially as described.

18. A re enerative reversing furnace having gas and air up-take flues, agas box removably sdpported on the upper end of the gas lip-take ue, abox rcmovably supported 0n the upper end of the air Lip-take fines, andorts 0r twyers earned by said boxes and ending into the furnace chamber,the

air box being so ported above the gas box;

lsrzanl Correction in Letters Patent No. 938,245.

In testimony whereof, we have hereunto set our hands.

LUTHER L. KNOX. MONTGOMERY MURRAY. Vitnesses:

Gno. ll. PARMELEH, H. M. Conwm.

' may conform to the record of the case in the Patent Olliee.

Signed and sealed this 11th day of October. A. 1).. late.

E. B. Moons,

lt is hereincertified that in Letters Patent No. 935.245, grantedOctober 26 1909 upon the application of Luther l1. Knox. ol' Ben Avon.and Montgomelv Mllrray of \Yilkiushurg. Pennsylvania for an improvementin Operrllearth Furnaces all error 2i[)]I(':ll'.- in the printedspecification requiring correction as follows: Page 3 line Bl thecompound word "air-surrounding should read m'r mrrrnmulml, and that l aI I I D, x v i tla mlHl Lem. latent slltllllCl he read wuli l'lllHcorrection therein that the same 0n the upper end of the air Lip-takefines, and orts 0r twyers earned by said boxes and ending into thefurnace chamber, the

air box being so ported above the gas box;

lsrzanl Correction in Letters Patent No. 938,245.

In testimony whereof, we have hereunto set our hands.

LUTHER L. KNOX. MONTGOMERY MURRAY. Vitnesses:

Gno. ll. PARMELEH, H. M. Conwm.

' may conform to the record of the case in the Patent Olliee.

Signed and sealed this 11th day of October. A. 1).. late.

E. B. Moons,

lt is hereincertified that in Letters Patent No. 935.245, grantedOctober 26 1909 upon the application of Luther l1. Knox. ol' Ben Avon.and Montgomelv Mllrray of \Yilkiushurg. Pennsylvania for an improvementin Operrllearth Furnaces all error 2i[)]I(':ll'.- in the printedspecification requiring correction as follows: Page 3 line Bl thecompound word "air-surrounding should read m'r mrrrnmulml, and that l aI I I D, x v i tla mlHl Lem. latent slltllllCl he read wuli l'lllHcorrection therein that the same ion in Correct Letters Patent No.938,245.

It is hereby vvl'tiliud that in Lettew Patent No. 1435.245, grantedOctober 26, 1909. upon tluupplivntiun ul' Lufhm' l1. Knox. of Bvu Avon,and Montgomery Murray, of \Vilkinshurg. |m|n \'h'unia. for an impmuamentin Upon-Hearth Ful'naces, an vrrul'n qwmx in thrr pl'inu-(lqwciliI-ubiun requiring vurrcction as follows: Page 3, limh'l'. themmpuund word ":liz sul'mundiHg" should read m'r .s-m-rmmrlml; and thatthe said bottom latunc shuuld lw read with this (orrm'tion therein thatthe same i may wilful-m to the I'm-0rd 0f the vase in thu Patent Ufh'vb.

Signed and sealer] this 11th day of Oclulwr. A. I). liill),

[SEAL] H. B. MOORE,

